arbitrariness, bee, boutade, capriccio, capriciousness, carelessness, characteristic, conceit, contrariety, crank, crankiness, crotchet, crotchetiness, divertissement, fancifulness, fancy, fantasia, fantasticality, foible, freak, freakishness, habit, heedlessness, humor, humoresque, humorsomeness, inconsiderateness, inconsideration, inconsistency, maggot, mannerism, medley, megrim, mood, moodiness, motivelessness, notion, peculiarity, perversity, petulance, potpourri, quirkiness, romance, romanza, temper, temperamentalness, thoughtlessness, trait, trick, unthoughtfulness, vagary, vein, whim, whimsicality, whimsicalness, whimsy
irresolution, infirmity of purpose, indecision, indetermination, undetermination, unsettlement, uncertainty, demur, suspense, hesitating, hesitation, hesitancy, vacillation, changeableness, fluctuation, alternation, caprice, fickleness, levity, legerete, pliancy, weakness, timidity, cowardice, half measures, waverer, ass between two bundles of hay, shuttlecock, butterfly, wimp, doughface, irresolute, infirm of purpose, double-minded, half-hearted, undecided, unresolved, undetermined, shilly-shally, fidgety, tremulous, hesitating, off one's balance, at a loss, vacillating, unsteady, unsteadfast, fickle, without ballast, capricious, volatile, frothy, light, lightsome, light-minded, giddy, fast and loose, weak, feeble-minded, frail, timid, wimpish, wimpy, cowardly, dough-faced, facile, pliant, unable to say 'no', easy-going revocable, reversible, irresolutely, irresolved, irresolvedly, in faltering accents, off and on, from pillar to post, seesaw, Int, how happy could I be with either!.
caprice, fancy, humor, whim, whimsy, whimsey, whimwham, crotchet, capriccio, quirk, freak, maggot, fad, vagary, prank, fit, flimflam, escapade, boutade, wild-goose chase, capriciousness, kink, capricious, erratic, eccentric, fitful, hysterical, full of whims, maggoty, inconsistent, fanciful, fantastic, whimsical, crotchety, kinky, particular, humorsome, freakish, skittish, wanton, wayward, contrary, captious, arbitrary, unconformable, penny wise and pound foolish, fickle, frivolous, sleeveless, giddy, volatile, by fits and starts, without rhyme or reason, nil fuit unquain sic inipar sibi, the deuce is in him.
Absence of Motive
absence of motive, aimlessness, caprice, chance, without rhyme or reason, aimless, capricious, whimsical, out of mere caprice.